I went to a predominantly all white boys and girls school, and I was friend with this Asian kid, he was poor and found it hard to make friends. So it didn't take very long before he became a target for the bullies with insults like "paki".
So one day he was being hanged from a tree branch by his underwear, most of the kids were staring at him doing nothing, and I was his only friend and knew someone had to do stop this!
So I took a deep breath, ran over and pushed one of them in a puddle, they were shocked, and unsurprisingly I became the new target.
But at least they stopped bullying him, and although I had no-one to stand up for me, I always managed to defend myself, with plastic lunch plates, rulers, tennis rackets anything I could find around me to defend myself.
I remember one of them tried to cut my lip, so the next day while he was eating in the canteen I grabbed a lunch plate and Boom! I smacked him at the back of his head, he spat his food out. I was never a push over!